You dont need cans to be IMAC legal. Some of us with da150's are running in cowl mufflers, these used with a mejzlik 32x10 and some throttle control produces a fairly quiet, lighter, easier, and also cheaper setup. I would argue that mine is as quiet in alot of cases. As my screen name suggest I am budget minded, but I have found you cant skimp to much on a 40 pound airplane.